Rotary take-up



April 20 1926.

i R. K. HOHMANN ROTRY TAKE-UP Filed Feb, 16, 1924 Patented Apr. 20,

UNITED lSTATES PATENT OFFICE.

RICHARD K. HORMANN, O

'CHINE COMPANY,

F PERU, INDIANA, AssIGNon 'ro oF PERU, INDIANA, A CORPORATION oF INDIANA.

HORMANN SEWING MA- ROTARY TAKE-UP.

Application mea February 16,1924. 'serial No. 693,175. f

To all 'whom it 'may concern.'

Be it known that MANN,

I, RICHARD K. Horra citizen of the UnitedStates,

and

resident of Peru, in the county of Miami and State of Indiana, have Invented certain new and useful Improvements in Rotary Take-Ups, of ication.

In the operation of .ing a rotary which the following is a specisewing machines havtakeup mechanism, much trouble has been experienced heretofore, from the tendency of the thread vto wrap 1tself around the thread deflecting parts of the takeup mechanismwhemas a resu breaking of the needle the work,

lt of the thread at or adjacent the portion of the thread passin through the takeup mechanism is release from the control to which 1t is mechanically subjected by the thread guiding and tension provisions of of the thread wind up the machine.

cially objectionable in the case yof the common type of rotary which the takeup mechanism takeup mechanism, in

comprises a pair offspaced-apart disks or plates, one of which is secured to the of the sewing end of the main shaft machine and carries the second part through thread defiecting studs eccentric to the axis o f the main shaft and extending across the thread passage between the plates or disks. In nism,

such a takeup mecha-Y when the needle thread breaks at or adjacent the work, a considerable amount of thread frequently wraps tightly about thethread deflecting studs before the operator,` following his Ydiscovery that the needle .thread is broken, brings the machine to a standstill. The thread thus wrapped the takeupY mechanism is more important, the

up in is wasted, and, what removal of the thread so wrapped up 1sv a time consuming operation which may,

and does frequently result in a roughening of one or the otherof the adjacent surfaces of the takeup plates by the screwdriver or other implementordinarily employed. by the operator to remove the thread wound up in the takeup machanism. This roughening of the thread guiding sur-y faces of the takeup plates is in itself a matter of some Importance, as the thread is apt to be caught on and broken by the roughened surfaces of the plates when the machine shaft is again p ation.

ut into regular oper- This tendency to wrap about parts of, and to in the takeup mechanism is espelsewing machine.

Various expedients have heretofore been Y proposed for preventing or minimizing the `objectionable consequences nof the thread winding up lin the takeup mechanism following a breakage in the needle, thread at takeup havingthe spaced-apart plates re` ferred to above, I provide the takeup ywith a special thread deflecting part securedto the plates and extending through an opening 1n the front plate of the takeup with one portion of its outer thread deflecting edge in front of the outer surface ofthe front takeup platevand with another portion of said edge inclined to the planes of said plates and extending across the thread passage between the plates in such position relative to the regular thread deflecting parts crossing such space'that it will have no, or at least no significant effect on the thread in the normal operation of the machine, but, in case of thread breakage, willi engage the thread winding, o-r tending to wind about said regular thread deflectingv parts, and cam or wedge a portion thereof through the opening in the front plate, in position to be engaged by a stationary or non-rotatable thread stripping part or knife which I mount on the stationary framework of the The various features of novelty which characterize vmy invention are pointed out with particularity, in the claims annexed to yand forming a part of this specification.

For a better understanding of the invention, however, its advantages and specific objects attained with its use, reference should be lhad to the accompanying drawings andv descriptive matter in Vwhich I have illustrated and described a preferred embodiment of my invention.

Of' the drawings I Fig. l is an end elevation of a portion of a sewing machine; 1 l Fig. 2 is a partial section on the line 2-2 of Figl; Y

Fig. 3 is a view taken similarly `to Fig. 1 but on a larger scale and showing a portion only of the mechanism shown in Fig. 1; and

Fig. 4 is a partial section on the line 4 4: of Fig. 3.

In the embodiment of my invention villustrated in the drawings, A represents the arm of a sewing machine Ohaving a rotary takeup comprising an apertured disk or wheel-like rpart ksecured tothe end of .the main shaft B of the sewing machine, and a second apertured diskor wheel-like ypart D Agenerally similar in shape to the ypart C and placed immediately in front of the latter, from which .it ,is sepia-rated by a space forming a thread passage. The part D is secured to the part C by a thread `deilecting .stud E located adjacent the peripheries of the parts C and D, and by a. stud `F angularly to the rearlof thestud E, having reference kto the direction of rotation of the takeup, which, as shown, is in the counter-clockwise direction. The takeup mechanism as shown also comprises a thread deflecting stud G carried by lthe .disk C adjacent its periphery and ,angularly to the rear of the stud F. rlhe stud projects from the rear face of the disk C and travels in the annular space between the peripheral portions of the disk C and a stationary part H, which is secured tothe arm A, and is provided with a central passage for the shaft B. The part H is of dish-like shape with its body portion closely adjacent to the disk C, and is formed with a kerf H in its lower portion, which is open at its lower edge and forms a thread passage for the portion of the needle thread T extending between thread guides I and J at the opposite sides of the takeup. The thread T passes from the usual needle-thread tension device K to the thread guide 1, whiclnas shown, comprises an eye in the end of a lever 1, the latter being adjustable manuallyor automatically in a known man-V ner to vary the thread takeup as the thickness of the work sewed varies. The thread guide J is inthe form of an eye formed in or supported by the arm A. From the thread guide J the thread passes through `the thread space between thedisks C and D and over the thread deflecting studs E and F, to a stationary thread guide L car- `riedfby the arm A, and thence to the needle M. In so far as above described, the takeup mechanism is of the special type disclosed Vand claimed in my prior application Serial No. 511,407, filed October 29, 1921, and primarily intended for use in a sewing machine developed by me for the rapid formation of stitches with a rotaryhook stitch forminglmechanism in which the thread-holding bobbin is much larger than has heretofore Abeen used in high speed sewing machines,

so that the takeup movement VIVgiven the needle thread is unusually great in extent.

and rim ,portions and connecting curved s oke aortions or :arms C and D wher'ebX7 Vthe weights of these parts of the takeup mechanism. are desirably reduced, and the thread is open to inspection and manipulation when this is necessary `in `initially threading the machine or as a result of thread breakage. The special thread defiector O provided in accordance withy the present invention, extends across the thread passage between the disks C and D, and projects through the Opening between the spoke D to which the stud F is connected and the spoke D angularly in advance thereof. As shown, the member O is in the form of a metal bar lying between, and extending transversely to the line connecting the studs E and F, and comprises asportion lying in front of the spoke D to which the stud Fis connected, and a second portion in advance of the spoke .D which bears against the adjacent spoke C which is widened for the purpose. The member O may be brazed `or otherwise secured to one or both of the adjacent spokes'C and D. The rear portion O2 of the outer yedge of the member O may be, and is shown as parallel to, and in frontof the disk D, but the front portion O of said outer edge is inclined to the planes ofthe disks@ and D, so that it forms an inclined cam-like thread deflecting surface extending across the space between the disks C and D and through the opening between the adjacent spokes D', merging into the edge portion O2 in front ofthe Afront surfaceof the disk D.

A thread stripping device P co-operates with the Vdeilector O to engage the thread wrapping or tending to wrap around the studs E and F in case .of needle thread breakage, as hereinafter described. As

shown, the stripping device P is in the .form of a knife blade, whichextends transversely to the planes of the disks C and D through a slot Q in the end of a support Q which is secured to the arm A and extends in front of the disk D. The body P of the knife `1D is shown as extending parallel to the support Q and 4secured to thelatter by .a screw P2. Advantageously and preferably, the stripping device P is so located that it will engage .thread wrapped about the studs E and F when the latter are in the position occupied by them at, or near the end of each stitch tightening operation.

In the normal operation of the machine, the portion of the thread T running from the guide J, to the stud E will be held by the tension on the thread at the rear of the inn-er end vof the stripper O as shown in Fig. 2, when the thread passes the stripper P. In case of needle thread breakage, however, the thread wrapping about the studs 'E and F is drawn up over the cam edge O of the deflector, as shown in Figs. 3 and 4:, in position to be engaged by the stripper' P as the takeup revolves. On such engagement, the stripper P pulls the thread olf the studs, or, and more usually with the machine in rapid operation, the stripper l? cuts the thread. In consequence, the thread running from the thread guide J through the space between the disks C and D will be shortened, or will have its free end pulled out between the adjacent arms D', so that it will not thereafter wrap around the studs E and F.

The use of the present invention thus avoids the thread wastage which results when, following a breakage of the needle thread, the latter is permitted to wind up in the takeup mechanism until the operator discovers the trouble and stops the machine. This item of thread wastage is of some .importance in the case of high speed machines, as considerable thread will ordinarily be wound up in the machine before the operator brings the machine to a standstill following a breakage of the needle thread. The thread wastage thus produced is relatively unimportant, however, in comparison with the time and labor lost in removing the thread wound up in the takeup mechanism, and, moreover, the removal of this thread, which the operator ordinarily effects by means of a screwdriver or any analogous implement which may be at hand, frequently involves scoring the adjacent surfaces of the thread takeup parts C and D, and the burrs or rough edges thus formed on these faces tend to catchand break the thread in the subsequent operation of the machine.

While in accordance with the provisions of the statutes I have illustrated and described the best form of my invention now known to me, it will be apparent to those skilled in the art that changes may be'made 1n the form of the apparatus disclosed without departing from the spirit of my invention, as set forth in the appended claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a rotary takeup mechanism for sewing machines comprising a rotating thread deflecting means about which they thread tends to wind up in case of thread breakage,

the improvement which consists in a thread defiector rotating with said means and located with respect thereto in position to be engaged by the thread wrapping around said means andV shaped to deflect a portion of the thread so engaging it laterally out of the path of movement of said means.

2. In a rotary takeup mechanism for sewing machines comprismgrotating thread defl'ecting means about which the thread tends tov wind up in case of thread breakage, the improvement which consists in a thread delector rotating with said means and located with respect thereto in position to be engaged by the thread wrapping around said means and shaped to deflect a portion of the thread so engaging it laterally out of the path of movement of said means, and a nonrotating thread stripper adapted to engage said deflected thread portion.

3. In a rotary takeup mechanism for sewing machines comprising rotating thread deflecting means about which the thread tends to wind up incase of thread breakage, the improvement which consists in a thread deflector rotating with said means and located with respect thereto in position to be engaged by the thread wrapping around sai-d means and shaped to deflect avportion of the thread so engaging it laterally out 0f the path of movement of said means, and a non-rotating thread knife against which said deflected thread portion is moved by the rotation of said means.

4.. In a rotary takeup mechanism for sewing machines, the combination with a platelike member rotating about an axis, and a pair of thread deflecting parts mounted on said member at yone side thereof and located at different Idistances from said axis, 'said member being formed with an opening adjacent said parts, of a thread deflector connected to said member and projecting through said opening and having an edge inclined to and extending across the path of movement of said parts, in position to engage thread wrapping about said parts and deliect a portion thereof through said open- 5'. In a rotary takeup mechanism comprising a pair of plate-like members rotating about an axis and separated by a thread passage and thread deflecting studs extending across said passage and connecting said members, one of the latter being forme-d with an opening adjacent said studs, the improvement which consists in a'thread deflector secured to said members and having an inclined edge which extends through said opening and across said thread passage and serves to deflect a portion of any thread wrapping about said studs out of said passage and through said opening.

Signed at New York city in the county of New York and State yof New York this 13th day of Februar A. D. 1924.

RII-IARD K. HOHMANN. 

